Bell System Practices
Western Electric Telephones and Equipment
As scanned by Frank Harrell (AKA Cowboy Frank)

File Naming Conventions
 NameSizeDescription
[DIR]Parent Directory -  
[ ]518-000-000-i58_1983-05-01.pdf278K  Numerical Index, Key Telephone Systems, Video Sstations, and Switching Systems, Customer Equipment
[ ]518-010-101-i02_1976-03-01.pdf1.9M  Centralized key telephone installations
[ ]518-010-105-i02_1975-09-01.pdf1.3M  Key telephone system, grounding and special protection requirements
[ ]518-010-106-i03_1978-12-01.pdf271K  Power unit selection, key telephone systems, and key service units
[ ]518-010-107-i01_1972-06-01.pdf420K  Key telephone systems, reserve power 47c power unit
[ ]518-010-108-i03_1976-10-01.pdf433K  Common audible signaling, key telephone systems
[ ]518-010-108-i05_1980-11-02.pdf256K  Newer Issue
[ ]518-010-109-i01_1976-08-01.pdf311K  Voice station signaling on manual intercoms
[ ]518-010-110-i01_1976-06-01.pdf142K  2A1 matrix block
[ ]518-010-111-i02_1978-03-01.pdf1.1M  Message waiting consoles used with 1A, 1A1, or 1A2 key telephone systems
[ ]518-010-115-i01_1976-11-01.pdf588K  Hands-free answering on intercom 1A1, 1A2, and 6A key telephone systems
[ ]518-010-116-i01_1978-12-01.pdf333K  278A Paging Adapter Circuit Adapter
[ ]518-112-420-i01_1970-07-01.pdf1.2M  1A key telephone system 50-type packaged units
[ ]518-112-421-i02_1973-11-01.pdf965K  1A key telephone system, tie line and control services
[ ]518-112-422-i01_1970-07-01.pdf250K  1A key telephone system intercom services
[ ]518-114-110-i03_1972-10-01.pdf2.1M  1A1 key telephone system, key telephone units (KTU)
[ ]518-114-115-i01_1970-07-01.pdf850K  1A1 key telephone system packaged key telephone units (KTU)
[ ]518-114-116-i02_1971-09-01.pdf319K  1A1 key telephone system, touch-tone adapters
[ ]518-114-425-i03_1974-07-01.pdf2.8M  1A1 key telephone system, key telephone units (KTU)
[ ]518-114-430-i01_1974-08-01.pdf2.3M  1A1 key telephone system 200F, 200G, and 200K packaged key telephone units
[ ]518-114-431-i03_1972-09-01.pdf1.3M  1A1 key telephone system, 200H packaged units
[ ]518-114-432-i01_1970-08-01.pdf2.4M  1A1 key telephone system, key service units (KSU)
[ ]518-215-100-i06_1977-03-01.pdf1.2M  1A2 key telephone system (KTS) Arangements
[ ]518-215-100-i07_1980-06-02.pdf2.8M  Newer Issue
[ ]518-215-400-i02_1978-12-03.pdf112K  Addendium
[ ]518-215-400-i06_1978-05-01.pdf2.2M  1A2 KTS, line services, KTUs 400B, 400C, 400D, 400G, 414A, 415A, 416A, 418A, 419A
[ ]518-215-401-i03_1977-12-01.pdf1.6M  1A2 KTS, auxiliary line services, KTUs 405A, 406A, 417A, 428A, 429A, 429B, 451B, 471A, 471B, 479B, 498A
[ ]518-215-402-i02_1977-01-01.pdf2.4M  1A2 KTS, intercom services KTUs 401A, 407, 420A, 422B, 423A, 424, 425, 426A, 427, 440A, 476A, 478B
[ ]518-215-403-i02_1978-05-01.pdf1.0M  1A2 KTS, control services KTUs 402A, 404A, 412A, 413A, 421A, 448A, 449A, 469A
[ ]518-215-404-i01_1974-05-01.pdf1.0M  1A2 KSU, 501 and 502 type key (Key Service Units)
[ ]518-215-405-i01_1978-05-03.pdf583K  Addendium
[ ]518-215-405-i06_1977-03-01.pdf9.1M  1A2 KSU, 513, 514, AND 515 types
[ ]518-215-407-i01_1976-07-01.pdf1.4M  1A2 KSU, 550 and 551 types
[ ]518-215-407-i02_1981-06-01.pdf1.1M  1A2 KSU, 550 and 551 types
[ ]518-215-410-i07_1976-12-01.pdf2.8M  1A2 KSU, panels 583 and 584 types
[ ]518-215-417-i01_1978-03-03.pdf428K  Addendium
[ ]518-215-417-i05_1977-06-01.pdf4.8M  1A2 KSU, 597 and 598 type panels
[ ]518-215-418-i02_1971-11-01.pdf3.2M  1A2 KTS, 601, 602 and 603 type panels
[ ]518-215-419-i04_1978-11-01.pdf5.8M  1A2 KTS, 620A, 641A, and 642A modular panels
[ ]518-215-419-i05_1980-06-02.pdf8.8M  Newer Issue
[ ]518-215-419-i06_1981-07-01.pdf3.3M  1A2 KTS, 620A, 641A, and 642A modular panels
[ ]518-215-420-i01_1978-04-03.pdf399K  Addendium
[ ]518-215-420-i05_1977-06-01.pdf4.2M  1A2 KTS, 69B 69D and 69G apparatus mountings
[ ]518-215-421-i01_1976-09-01.pdf1.2M  1A2 KTS, 626A modular panel
[ ]518-215-421-i02_1979-04-01.pdf4.2M  1A2 KTS, 626A modular panel
[ ]518-215-422-i01_1978-05-01.pdf3.9M  1A2 KTS, 110A apparatus mountings
[ ]518-215-422-i03_1980-06-02.pdf5.1M  Newer Issue
[ ]518-220-400-i02_1966-09-01.pdf818K  400 A B C and D type key telephone units
[ ]518-220-400-i02_1966-10-01.pdf548K  400 A B C and D type key telephone units
[ ]518-220-401-i01_1966-04-01.pdf215K 
[ ]518-220-402-i01_1966-11-01.pdf277K 
[ ]518-270-101-i01_1967-03-03.pdf162K  Addendium
[ ]518-270-101-i02_1966-06-01.pdf1.9M  Panels 583 and 584 types
[ ]518-300-413-i04_1972-01-01.pdf199K  259 type Key telephone unit
[ ]518-300-417-i01_1973-10-01.pdf141K  272A type Key telephone unit
[ ]518-310-401-i02_1967-01-01.pdf972K  227A and 227B KTU, audible and visual signaling
[ ]518-310-405-i05_1970-04-01.pdf733K  Station line concentrators, 235 and 236 type KTU
[ ]518-310-407-i05_1968-09-01.pdf250K  237 type Key telephone unit
[ ]518-310-407-i08_1974-05-02.pdf494K  Newer Issue
[ ]518-411-100-i01_1978-08-01.pdf4.7M  6B Key telephone system, Dialog Intercom System
[ ]518-411-100-i01_1978-10-03.pdf 63K  Addendium
[ ]518-450-100-i01_1975-12-03.pdf212K  Addendium
[ ]518-450-100-i01_1980-04-03.pdf104K  Addendium
[ ]518-450-100-i01_1982-10-03.pdf102K  Addendium
[ ]518-450-100-i02_1975-08-01.pdf 11M  7A, communication system, (com key* 718)
[ ]518-450-100-i03_1976-10-01.pdf9.8M  7A, communication system, (com key* 718)
[ ]518-450-100-i04_1979-04-01.pdf 15M  7A, communication system, (com key* 718)
[ ]518-450-100-i05_1982-02-02.pdf3.4M  Newer Issue
[ ]518-450-102-i01_1974-03-01.pdf9.1M  14A, communication system, (com key* 1434)
[ ]518-450-102-i01_1974-07-02.pdf316K  Newer Issue
[ ]518-450-102-i01_1974-07-03.pdf321K  Addendium
[ ]518-450-102-i02_1980-04-02.pdf104K  Newer Issue
[ ]518-450-102-i02_1980-04-03.pdf106K  Addendium
[ ]518-450-102-i03_1978-06-01.pdf 23M  14A, communication system, (com key* 1434)
[ ]518-450-102-i04_1981-02-02.pdf 24M  Newer Issue
[ ]518-450-105-i01_1975-07-01.pdf1.6M  4A, communication system, (com key* 416)
[ ]518-450-105-i01_1975-07-02.pdf5.0M  Newer Issue
[ ]518-450-105-i01_1975-09-01.pdf3.5M  4A, communication system, (com key* 416)
[ ]518-450-105-i01_1981-04-03.pdf162K  Addendium
[ ]518-450-105-i02_1976-05-01.pdf4.7M  4A, communication system, (com key* 416)
[ ]518-450-106-i01_1981-07-03.pdf205K  Addendium
[ ]518-450-106-i02_1977-12-01.pdf4.8M  4A, communication system, (com key* 416) using 981/2981 and 983/2983 telephone sets
[ ]518-450-106-i03_1980-01-01.pdf9.3M  4A, communication system, (com key* 416) using 981/2981 and 983/2983 telephone sets
[ ]518-450-106-i03_1980-01-02.pdf9.2M  Newer Issue
[ ]518-450-110-i01_1976-12-01.pdf3.3M  21A, communication system, (com key* 2152)
[ ]518-450-110-i01_1978-03-03.pdf259K  Addendium
[ ]518-450-110-i01_1980-04-01.pdf6.6M  21A, communication system, (com key* 2152)
[ ]518-450-110-i01_1980-04-03.pdf114K  Addendium
[ ]518-450-110-i01_1982-10-03.pdf 97K  Addendium
[ ]518-450-110-i02_1979-07-01.pdf6.7M  21A, communication system, (com key* 2152)
[ ]518-450-110-i03_1981-01-02.pdf6.7M  Newer Issue
[ ]518-800-100-i03_1972-04-01.pdf2.4M  Picturephone Service single line service and 1P2 key telephone arrangements, 2C video Telephone Station
[ ]518-800-105-i03_1972-04-01.pdf3.1M  Picturephone service 1P2 key tleephone system 600 series key telephone units
[ ]518-800-110-i03_1972-03-01.pdf1.8M  Picturephone service 2C video telephone station ident and instllation
[ ]518-800-301-i01_1970-04-01.pdf340K  2C video telephone station method of operation
[ ]518-800-401-i03_1972-01-01.pdf576K  Picturephone service 2C video telephone station connections
[ ]518-800-501-i02_1972-01-01.pdf1.4M  Picturephone servcice 2C video telephone station operational tests using 136A test set

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Site first posted January 30, 2012       Domain regesterd: Febuary 1, 2012